Do a search for the "Swag Pack". Disclaimer: If for any reason the anticheat thinks you're cheating due to third party mods, we are not liable for losses.
Myself I use the Swag pack, the Freelancer - New Ambiences Sound Mod and the Freelancer HD Starsphere pack. Makes Freelancer look and sound 100% better. Install the Freelancer HD Starsphere pack last (340 megs)